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http://hdl.handle.net/2183/38895 Solution-State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers
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Soro, Lohona Kevin
Knighton, Richard C.
Thor, Waygen
Przybilla, Frédéric
Jeannin, Olivier
Charbonnière, Loïc J.
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Soro, L. K., Knighton, R. C., Avecilla, F., Thor, W., Przybilla, F., Jeannin, O., Esteban-Gomez, D., Platas-Iglesias, C., & Charbonnière, L. J. (2023). Solution-State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers. Advanced Optical Materials, 11(11). https://doi.org/10.1002/ADOM.202202307
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Abstract
[Abstract] Two homometallic ytterbium dimers are prepared and their solution-state photoluminescence and upconversion properties are investigated. Both complexes exhibit two-photon cooperative luminescence upconversion in the visible region (λem ≈ 510 nm) upon excitation into the near-infrared Yb 2F5/2 ← 2F7/2 absorption band at 980 nm. This miniaturization of the cooperative luminescence phenomenon down to just two Yb ions unequivocally proves the mechanistic origins of this process. Time-resolved measurements and excited-state modeling indicate the presence of a slow recombination of two singly excited ions Yb*Yb* into a virtual excited state, which ultimately gives rise to the observed emission at ≈510 nm.
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